Telecommunication system



April 4, 1950 G. DEAKIN TELECOMMUNICATION SYSTEM 18 Sheets-Sheet l.

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GERALD DEA/UN Patented pr. 4i', S

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TELECOMMUNICATION SYSTEM'.

Gerald*Deakin;A NeW'Xoi-k, N.-Y.'}`ass'gnor ton ternational Standard Electric' Corporation, New.:LA l

York; N. Y YL, al corporation; of Delaware originaiepplicauon February-#551944," serial No.

' Tiiisrinventon `relates to new A'and 'useful' i im' proVements in automatic"telephonesystems andV moreparticula 'lyinzregister controllers for such systems. Thevpresent is a division of my copendingaopli'cation SerialNo' 521",'1.60.`;1ed' February 5;,1'1'944."

lIn accordancewith onefeature ofthe present' invention, a translator may' 'be' connettedv with any one ofuagplurality'of registerswhichl. taken into-us'eover.elinksfranm huntingswitcheslwhch doznots'fornrpaiitof theiregister: proper:

Another feature of tneizconnfectionfof a- `translator f-withitheregister f undenthe control' of fthedigitswitchesof `the `registeff neither-associated control equipment.

Irnthefsystenr'omminventiomzone ofthe' ofce prefix' digits, e. g. the second digit;f'rstart`s the operation' ofairtranslatofznnder '-.whichathenihunts foniazpotentael:correspondingtora vpotential applied by` the first digitis'witch-, Ithe iastrmentioned potential being determined by:thefrstiidigt difaledi'- .Theifunctioning of" the translatorsnnder is determined by the poteititials'v` 1Selected-ley the of the dialing.

Accordingv to other." features :of the invention,

the translatorsrnay control' therbylpa'ssingof certain v'selectors so aste permit 1the expeditious handling of 'lieavy'local traiiic';l andcan-handleleither two-.or threedigitiofeevprexes.. f

n These. and-.-other features'oi the` linvention will moreclearl-y appeanfromlthe fol-lowing. detailed l description and the appendedcclaimsz'b As muchf of: .a muitieofcersystem.' will" be.: described-asis necessary'v for: a.' lclear understanding l of the invention. While a telephonelsystem of many-other itypesof switching systen'is;`r whether they aroused for establishing telephone -connections or foran'y other purposes;

,s In the drawings:

j Figi; Lis a block diagram. showingthe: general lay-out oftliesysteng. n

Figs. v.2a. to 2e.illustrate the various I: selector nlf. 3 shows an al1-purpose selectoiifcircuit this` applicationwctoberN i whichmaynbes.adjuste'di'for various purposes'uinf expressionsiusedv in: .the specification fand claims; A ffMultiepotentiallfl Working or ioperationi rnean's'vv 28 aff-.selective operation. in.. which i'fa linurnerioal-l or'y non-numericabswitchi, @such as` a-sele'ctor or line iiri'der;:is stoppe'dfundernthe control ofaa device;-

ezegrvan electricalzdscharge: l tube providedvinlf ia: register controller whenfza `certain predetermined- 3.@ relationshipexistsfbetween"two potentials 'simu-l"-l taneously lapplied -to-saidtdevice. Oneof said potentials' 'isV` applied in accordance with the numericalor somevoth'er designationfor cha-racteri'sticof this linetobe' selected, and the-otherpo 35: tenty 1Sundenitii'econtrol -ofrtlfiefnumericalorA non-numerical. switch` 1 during L its-1 operation.

. B-linlr designates a link extending betweengroup; selectors;:'fTr-linkfl is a link-by meanslofy 45 istermisga. .registencontrolleiilby means'of whichA the:- establishment ofcallsl originating 'within'y the exchange is controlled; .Tregister-'i's a register cated; Final means the final selector or connector by means of which the called line is seized.

For the sake of brevity, the words contact and relay will not be repeated when reference is made to the front or back Contact of a relay. Thus back BER means the back contact of relay BER.

' GENERAL The selection circuit The switching mechanism is a high speed, tube controlled, four brush selector adapted to hunt over a single unsplit bank of the type disclosed in Patent No. 2,336,471, issued December 14, 1943-,

and Patent No. 2,330,812, issued October 5, 1943. The unsplit bank is made possible by the multipotential selection arrangement here used and fully described in my PatentNo. 2,351,016, issued June 13, 1944; Patent No. 2,380,950, issued August 7, 1945; the patent of H. F. Herbig, No. 2,354,682,

issued August 1, 1944, and the applications re-v 1st line finder, Fig. 2c

used with a. B-link 2nd line nder, Fig. 2b

1st group selector, Fig. 2b usual connection circuit Local group and penultimate selectors, Fig.l 2a

Final selector, Fig. 2d used with F-link (Fig. 9)

vIncoming trunk selector, Fig. 2e

,Special service group selector, Fig. 2c Tandem selector, Fig. 2e

Register control with translation The system is register controlled. The register in the originatinggofce-the so-called A-register-is connected to B-links (Fig. 1) through R- links. The R-links contain the equipment for handling the requirements of ringing, busy'calls, metering, coin machines and other similar functions. For large areas where translation is necessary, translator links are associated with the register. Where mixed twoand three-digit oirlce prefixes are used, twoand three-digit translators are also used. Eachtranslator link has a register finder and translator finder. The banks of the translator iinders are multipled, and one cross-connection for each oiice prex sufces for all translators.

, The trunks incoming from other offices (Fig. 1) terminate in groups of relaysdesignated as T- links-which are cross-connected tostandard al1 (Fig. 7) forms the` purpose switching selector circuits. The registers which handle incoming calls-the so-called T- registers-are connected to the T-links through TR-links, corresponding to the R-links used with the A-registers. The possibility of cross-connecting and of using any group selector for local or incoming connections is a great convenience in a growing and changing network.

Adding translation to unsplit selector banks such as are used in the present system, greatly increases the efciency ofthe trunk plan in large networks. Selections may be suppressed or bypassed, for example, from the second group selectors to the penultimate selector for handling heavyl local trac, This is indicated by dotted lines in Fig. 1. Trunks may be routed in any convenient manner and not according to a fixed numerical designation as is necessary in systems without translation. Additional selections may be introduced to provide for large group concentrations .for the more economical use of long and important loaded trunks, etc.

` The translator controls the re-routing of calls and is automatically connected with the register depending on the number dialed. After it had performed its function, the translator is disconnected from the register.

Register relays (total 37) An explanation ofthe functions of the various relays will be helpful in tracing the circuits of the register. The relays may be divided vinto the following four groups:

(a) Register proper (18 relays, Figsk 10, 10a):

DR--dialing relay. Follows dialimpulses.

RlR-slow release relay. Does not fall off during pulsing.

RZB-slow releasing change-over relay. Does not fall off during pulses but only when the circuit is opened between the dialing of digits when DR comes to rest on its Lfront contact.

RAR-operates when the register is picked up and adapts the register to select the rst line finder and the calling line.

HBR- operates when the calling line is picked up by the first line finder and releases RAR.

RCR/-multi-contact relay to provide ground holding contacts,

RDR-operates when the rst pulse is received and transfers the grid of VlB from the calling line potential PC to the busy potential PB thus adapting the register to vcontrol the selectors.

RER- disconnects the identifying service class potential PS when dialing commences and in place thereof connects potential PJ to the grid of VlA.

RFR-low resistance relay in series with the a wire. Operates when the selector is hunting.

RGR-a slightly slow releasing relay. Operated by RFR and when operated, connects the grid of VlA to the PN or PT potential and, when on its back contact, to potential PJ. This relay always makes its back contacts before relay GSRl breaks its front contacts.

RLR-operates When the units are being selected. Prepares register for release or change to in-dialing to P. B. X.

RPR-operates when tens are being dialed to remove potential PB from the grid of VIB. 

